I am helping debug some code that exec the following script is there any reason why its not writing a file to the server? - if that what it does. All the $ data and permissions are ok:
Script:
#!/bin/bash
RANGE=$1
ALLOCATION=`echo $RANGE | cut -f1,2,3 -d'.'`
/sbin/ip rule add from $1 lookup $2
echo $ALLOCATION
rm /path/too/file/location/$ALLOCATION
for i in `seq 3 254`
do
echo $ALLOCATION.$i >> /path/too/file/location/$ALLOCATION
done
ETH=`/sbin/ifconfig | grep eth0 | tail -n1 | cut -f2 -d':' | cut -f1 -d' '`
Related
I'm extracting two md5sums by using this code:
md5sum test{1,2} | cut -d' ' -f1-2
I'm receiving two md5sums as in example below:
02eace9cb4b99519b49d50b3e44ecebc
d8e8fca2dc0f896fd7cb4cb0031ba249
Afterwards I'm not sure how to compare them. I have tried using the xargs:
md5sum test{1,2} | cut -d' ' -f1-2 | xargs bash -c '$0 == $1'
However, it tries to execute md5sum as a command
Any advice?
Try using a command subsitution instead
#!/bin/bash
echo 1 > file_a
echo 2 > file_b
echo 1 > file_c
file1=file_a
# try doing "file2=file_b" as well
file2=file_c
if [[ $(sha1sum $file1 | cut -d ' ' -f1-2) = $(sha1sum $file2 | cut -d ' ' -f1-2) ]]; then
echo same
else
echo different
fi
I have a script whose content is like:
#!/bin/bash
DB_FILE='pgalldump.out'
echo $DB_FILE
DB_NAME=''
egrep -n "\\\\connect\ $DB_NAME" $DB_FILE | while read LINE
do
DB_NAME=$(echo $LINE | awk '{print $2}')
STARTING_LINE_NUMBER=$(echo $LINE | cut -d: -f1)
STARTING_LINE_NUMBER=$(($STARTING_LINE_NUMBER+1))
TOTAL_LINES=$(tail -n +$STARTING_LINE_NUMBER $DB_FILE | \
egrep -n -m 1 "PostgreSQL\ database\ dump\ complete" | \
head -n 1 | \
cut -d: -f1)
tail -n +$STARTING_LINE_NUMBER $DB_FILE | head -n +$TOTAL_LINES > /backup/$DB_NAME.sql
done
I know what it is doing. But i have a doubt about the flow of do while in this case. At line egrep -n "\\\\connect\ $DB_NAME" $DB_FILE | while read LINE will egrep runs first or while . Because DB_NAME is empty at start of code.
Could anyone please explain the flow of do while in this case.
Short and direct, basically I want to use the value of $command on a variable, instead using it inside the while loop as a command itself. So:
This Works, but I think it's ugly:
#!/bin/bash
IFS=$'\n'
lsof=`which lsof`
whoami=`whoami`
while true ; do
execution_array=($(${lsof} -iTCP -P 2> /dev/null | grep ':' | grep ${whoami} | awk '{print $9}' | cut -f2 -d'>' | sort | uniq ))
for i in ${execution_array[*]}; do
echo $i
done
sleep 1
done
unset IFS
This doesn't work ( no output happens ), but i think is less ugly:
#!/bin/bash
IFS=$'\n'
lsof=`which lsof`
whoami=`whoami`
command="${lsof} -iTCP -P 2> /dev/null | grep ':' | grep ${whoami} | awk '{print $9}' | cut -f2 -d'>' | sort | uniq"
while true ; do
execution_array=($(command))
for i in ${execution_array[*]}; do
echo $i
done
sleep 1
done
unset IFS
This solved my problem:
#!/bin/bash
IFS=$'\n'
lsof=$(which lsof)
list_connections() {
${lsof} -iTCP -P 2> /dev/null | grep ':' | grep $(whoami) | awk '{print $9}' | cut -f2 -d'>' | sort | uniq
}
while true ; do
execution_array=($(list_connections))
for i in ${execution_array[*]}; do
echo $i
done
sleep 1
done
unset IFS
i use the following code to download all mysql database in a different file and not in one file (like --all-databases) and put them in the /backup/mysql folder
#!/bin/bash
mysqldump=`which mysqldump`
echo $mysqldump
mkdir /backup/mysql/$(date '+%d-%b-%Y')
echo "creating folder for current date done"
for line in "$(mysqlshow |cut -f1 -d"-" | cut -c 3- | cut -f1 -d" ")"
do
$mysqldump $line > /backup/mysql/$(date '+%d-%b-%Y')/"$line"
echo "$line\n"
done
I used the cut pipes to remove dashes and empty space before and at the end of the database name and it gave me what I want.
The problem is at line 13 according to bash but with no more details. Any ideas what I'm doing wrong?
mysqlshow output format
+---------------------+
| Databases |
+---------------------+
| information_schema |
| gitlabhq_production |
| mysql |
| performance_schema |
| phpmyadmin |
| test |
+---------------------
Your script doesn't manage the first 3 lines nor the last one, so you $line variable is invalid.
Solution
mysql | tail -n +4 | head -n -1 | tr -d '| '
tail -n +4: skip first four lines (may need adjustement);
head -n -1: ignore last line ;
tr -d '| ': remove pipe and space.
Advices
quotes your variables ;
use $() instead of backtick ;
don't use for i in $(ls *.mp3).
read How can I read a file (data stream, variable) line-by-line (and/or field-by-field)?
Better solution
Instead of a for loop you should use a while with a Process Substitution:
while read -r db; do
echo "[$db]";
done < <(mysqlshow -u root -p | tail -n +3 | head -n -1 | tr -d ' |' )
I am trying to build a Bash CGI Script that takes in coordinates as parameters from the url and uses osmosis to extract the map and the splitter and mkgmap to make the map so that it can be opened with Qlandkarte. My problem being is that when i type wget localhost/cgi-bin/script.pl?top=42&left=10&bottom=39&right=9&file=map.osm the linux terminal reads the file with the coordinates. How can I make wget just activate the script so it takes the coordinates and executes the commands. And also when the map is created at the end how can a return the file that was created by the script.
Thanks
#!/bin/bash
TOP=`echo "$QUERY_STRING" | grep -oE "(^|[?&])top=[0.0-9.0]+" | cut -f 2 -d "=" | head -n1`
LEFT=`echo "$QUERY_STRING" | grep -oE "(^|[?&])left=[0.0-9.0]+" | cut -f 2 -d "=" | head -n1`
BOTTOM=`echo "$QUERY_STRING" | grep -oE "(^|[?&])bottom=[0.0-9.0]+" | cut -f 2 -d "=" | head -n1`
RIGHT=`echo "$QUERY_STRING" | grep -oE "(^|[?&])right=[0.0-9.0]+" | cut -f 2 -d "=" | head -n1`
FILE=`echo "$QUERY_STRING" | grep -oE "(^|[?&])file=[^&]+" | sed "s/%20/ /g" | cut -f 2 -d "="`
$(sudo osmosis --read-xml file=bulgaria.osm --bounding-box top=$TOP left=$LEFT bottom=$BOTTOM right=$RIGHT --write-xml file=$FILE)
$(sudo java -Xmx900m -jar splitter.jar --max-nodes=110000 $FILE)
$(sudo java -ea -Xmx900m -jar mkgmap.jar --tdbfile --route -c template.args)
echo "Content-type: text/html"
echo ""